std::wcscoll
Defined in header <cwchar> | | |
|---|---|---|
int wcscoll( const wchar_t* lhs, const wchar_t* rhs ); | | |
根据最近安装的区域设置比较两个以空结尾的宽字符串。std::setlocale属性定义的LC_COLLATE类别。
参数
lhs, rhs | - | pointers to the null-terminated wide strings to compare |
|---|
返回值
负值lhs是少于%28先于%29rhs...
0如果lhs是等于rhs...
正值lhs是大于%28跟随%29rhs...
注记
排序顺序是字典顺序：字母在国家字母中的位置等价类%29比它的情况或变体有更高的优先级。在等价类中，小写字符在大写等价物和特定于地区的顺序之前进行排序，可以适用于具有对话式的字符。在某些地区，一组字符比较起来是单个的。校对单位例如，"ch"捷克文如下"h"先于"i"，和"dzs"匈牙利文如下"dz"先于"g"...
例
二次
#include <iostream>
#include <clocale>
void try_compare(const wchar_t* p1, const wchar_t* p2)
{
if(std::wcscoll(p1, p2) < 0)
std::wcout << p1 << " before " << p2 << '\n';
else
std::wcout << p2 << " before " << p1 << '\n';
}
int main()
{
std::setlocale(LC_ALL, "en_US.utf8");
std::wcout << "In the American locale: ";
try_compare(L"hrnec", L"chrt");
std::setlocale(LC_COLLATE, "cs_CZ.utf8");
std::wcout << "In the Czech locale: ";
try_compare(L"hrnec", L"chrt");
std::setlocale(LC_COLLATE, "en_US.utf8");
std::wcout << "In the American locale: ";
try_compare(L"år", L"ängel");
std::setlocale(LC_COLLATE, "sv_SE.utf8");
std::wcout << "In the Swedish locale: ";
try_compare(L"år", L"ängel");
}二次
产出：
二次
In the American locale: chrt before hrnec
In the Czech locale: hrnec before chrt
In the American locale: ängel before år
In the Swedish locale: år before ängel二次
另见
strcoll | compares two strings in accordance to the current locale (function) |
|---|---|
do_compare virtual | compares two strings using this facet's collation rules (virtual protected member function of std::collate) |
wcsxfrm | transform a wide string so that wcscmp would produce the same result as wcscoll (function) |
C文件
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